Bluetooth: bnep: Return err value while sending cmd is not understood

Send command not understood response should be verified if it was
successfully sent, like all send responses.

Signed-off-by: Grzegorz Kolodziejczyk <grzegorz.kolodziejczyk@tieto.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c
index c05eccc..5cf5fbd 100644
--- a/net/bluetooth/bnep/core.c
+++ b/net/bluetooth/bnep/core.c
@@ -239,7 +239,7 @@
 			pkt[0] = BNEP_CONTROL;
 			pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
 			pkt[2] = cmd;
-			bnep_send(s, pkt, sizeof(pkt));
+			err = bnep_send(s, pkt, sizeof(pkt));
 		}
 		break;
 	}